Research on the Dynamic Changes of Ecosystem Service Value of Composite System of Economy and Environment in Xining City

The coordinated development between environment and economy is an important way to realize sustainable development, and also the basic requirement of sustainable development. Ecosystem services function is the basis of sustainable development, its value changes are closely related with social economic development. It can be regarded a comprehensive and quantitative character of the regional ecological environment and a symbol of the regional sustainable development. This paper calculated the ecosystem service value changes by the land use changes, analyzed the dynamic changes of ecological service value in Xining city for nearly nine years from 2003 to 2011 according to appropriately adjusting the ecosystem services value of Chinese terrestrial ecosystem proposed by XIE Gao-di, and estimated Chinese terrestrial ecosystem service value by correcting the estimation method of the study area with the actual situation. The result showed that: the ecosystem service value of Xining city is a dynamic process from 2003 to 2008 year, it shows a marked increase the stage of 2003-2005 year; there is a small increase in the process of 2005-2007 year; various types of land ecosystem service value in Xining city is reduced in the stage of 2007-2009 year; And not much change in the stage from2009 to 2011year. On the whole, the composite system of economy - environmental development in Xining city is harmonious with each other in the study period, but the coordination standard is decreased gradually from a highly coordinated to low-grade. The problem of soil and water loss in Xining city needed to be solved.